src/Protocol/ActivityPub/Transmitter.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Protocol\ActivityPub;
  23
  24 use Friendica\Content\Feature;
  25 use Friendica\Content\Text\BBCode;
  26 use Friendica\Content\Text\Plaintext;
  27 use Friendica\Core\Cache\Duration;
  28 use Friendica\Core\Logger;
  29 use Friendica\Core\Protocol;
  30 use Friendica\Core\System;
  31 use Friendica\Database\DBA;
  32 use Friendica\DI;
  33 use Friendica\Model\APContact;
  34 use Friendica\Model\Contact;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\Item;
  37 use Friendica\Model\ItemURI;
  38 use Friendica\Model\Profile;
  39 use Friendica\Model\Photo;
  40 use Friendica\Model\Tag;
  41 use Friendica\Model\User;
  42 use Friendica\Protocol\Activity;
  43 use Friendica\Protocol\ActivityPub;
  44 use Friendica\Util\DateTimeFormat;
  45 use Friendica\Util\HTTPSignature;
  46 use Friendica\Util\Images;
  47 use Friendica\Util\JsonLD;
  48 use Friendica\Util\LDSignature;
  49 use Friendica\Util\Map;
  50 use Friendica\Util\Network;
  51 use Friendica\Util\XML;
  52
  53 require_once 'include/api.php';
  54 require_once 'mod/share.php';
  55
  56 /**
  57  * ActivityPub Transmitter Protocol class
  58  *
  59  * To-Do:
  60  * @todo Undo Announce
  61  */
  62 class Transmitter
  63 {
  64         /**
  65          * Collects a list of contacts of the given owner
  66          *
  67          * @param array     $owner  Owner array
  68          * @param int|array $rel    The relevant value(s) contact.rel should match
  69          * @param string    $module The name of the relevant AP endpoint module (followers|following)
  70          * @param integer   $page   Page number
  71          *
  72          * @return array of owners
  73          * @throws \Exception
  74          */
  75         public static function getContacts($owner, $rel, $module, $page = null)
  76         {
  77                 $parameters = [
  78                         'rel' => $rel,
  79                         'uid' => $owner['uid'],
  80                         'self' => false,
  81                         'deleted' => false,
  82                         'hidden' => false,
  83                         'archive' => false,
  84                         'pending' => false
  85                 ];
  86                 $condition = DBA::buildCondition($parameters);
  87
  88                 $sql = "SELECT COUNT(*) as `count`
  89                         FROM `contact`
  90                         JOIN `apcontact` ON `apcontact`.`url` = `contact`.`url`
  91                         " . $condition;
  92
  93                 $contacts = DBA::fetchFirst($sql, ...$parameters);
  94
  95                 $modulePath = '/' . $module . '/';
  96
  97                 $data = ['@context' => ActivityPub::CONTEXT];
  98                 $data['id'] = DI::baseUrl() . $modulePath . $owner['nickname'];
  99                 $data['type'] = 'OrderedCollection';
 100                 $data['totalItems'] = $contacts['count'];
 101
 102                 // When we hide our friends we will only show the pure number but don't allow more.
 103                 $profile = Profile::getByUID($owner['uid']);
 104                 if (!empty($profile['hide-friends'])) {
 105                         return $data;
 106                 }
 107
 108                 if (empty($page)) {
 109                         $data['first'] = DI::baseUrl() . $modulePath . $owner['nickname'] . '?page=1';
 110                 } else {
 111                         $data['type'] = 'OrderedCollectionPage';
 112                         $list = [];
 113
 114                         $sql = "SELECT `contact`.`url`
 115                                 FROM `contact`
 116                                 JOIN `apcontact` ON `apcontact`.`url` = `contact`.`url`
 117                                 " . $condition . "
 118                                 LIMIT ?, ?";
 119
 120                         $parameters[] = ($page - 1) * 100;
 121                         $parameters[] = 100;
 122
 123                         $contacts = DBA::p($sql, ...$parameters);
 124                         while ($contact = DBA::fetch($contacts)) {
 125                                 $list[] = $contact['url'];
 126                         }
 127                         DBA::close($contacts);
 128
 129                         if (!empty($list)) {
 130                                 $data['next'] = DI::baseUrl() . $modulePath . $owner['nickname'] . '?page=' . ($page + 1);
 131                         }
 132
 133                         $data['partOf'] = DI::baseUrl() . $modulePath . $owner['nickname'];
 134
 135                         $data['orderedItems'] = $list;
 136                 }
 137
 138                 return $data;
 139         }
 140
 141         /**
 142          * Public posts for the given owner
 143          *
 144          * @param array   $owner Owner array
 145          * @param integer $page  Page numbe
 146          *
 147          * @return array of posts
 148          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 149          * @throws \ImagickException
 150          */
 151         public static function getOutbox($owner, $page = null)
 152         {
 153                 $public_contact = Contact::getIdForURL($owner['url'], 0, true);
 154
 155                 $condition = ['uid' => 0, 'contact-id' => $public_contact, 'author-id' => $public_contact,
 156                         'private' => [Item::PUBLIC, Item::UNLISTED], 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
 157                         'deleted' => false, 'visible' => true, 'moderated' => false];
 158                 $count = DBA::count('item', $condition);
 159
 160                 $data = ['@context' => ActivityPub::CONTEXT];
 161                 $data['id'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 162                 $data['type'] = 'OrderedCollection';
 163                 $data['totalItems'] = $count;
 164
 165                 if (empty($page)) {
 166                         $data['first'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
 167                 } else {
 168                         $data['type'] = 'OrderedCollectionPage';
 169                         $list = [];
 170
 171                         $condition['parent-network'] = Protocol::NATIVE_SUPPORT;
 172
 173                         $items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
 174                         while ($item = Item::fetch($items)) {
 175                                 $activity = self::createActivityFromItem($item['id'], true);
 176                                 $activity['type'] = $activity['type'] == 'Update' ? 'Create' : $activity['type'];
 177
 178                                 // Only list "Create" activity objects here, no reshares
 179                                 if (!empty($activity['object']) && ($activity['type'] == 'Create')) {
 180                                         $list[] = $activity['object'];
 181                                 }
 182                         }
 183
 184                         if (!empty($list)) {
 185                                 $data['next'] = DI::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
 186                         }
 187
 188                         $data['partOf'] = DI::baseUrl() . '/outbox/' . $owner['nickname'];
 189
 190                         $data['orderedItems'] = $list;
 191                 }
 192
 193                 return $data;
 194         }
 195
 196         /**
 197          * Return the service array containing information the used software and it's url
 198          *
 199          * @return array with service data
 200          */
 201         private static function getService()
 202         {
 203                 return ['type' => 'Service',
 204                         'name' =>  FRIENDICA_PLATFORM . " '" . FRIENDICA_CODENAME . "' " . FRIENDICA_VERSION . '-' . DB_UPDATE_VERSION,
 205                         'url' => DI::baseUrl()->get()];
 206         }
 207
 208         /**
 209          * Return the ActivityPub profile of the given user
 210          *
 211          * @param integer $uid User ID
 212          * @return array with profile data
 213          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 214          */
 215         public static function getProfile($uid)
 216         {
 217                 $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
 218                         'account_removed' => false, 'verified' => true];
 219                 $fields = ['guid', 'nickname', 'pubkey', 'account-type', 'page-flags'];
 220                 $user = DBA::selectFirst('user', $fields, $condition);
 221                 if (!DBA::isResult($user)) {
 222                         return [];
 223                 }
 224
 225                 $fields = ['locality', 'region', 'country-name'];
 226                 $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid]);
 227                 if (!DBA::isResult($profile)) {
 228                         return [];
 229                 }
 230
 231                 $fields = ['name', 'url', 'location', 'about', 'avatar', 'photo'];
 232                 $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
 233                 if (!DBA::isResult($contact)) {
 234                         return [];
 235                 }
 236
 237                 $data = ['@context' => ActivityPub::CONTEXT];
 238                 $data['id'] = $contact['url'];
 239                 $data['diaspora:guid'] = $user['guid'];
 240                 $data['type'] = ActivityPub::ACCOUNT_TYPES[$user['account-type']];
 241                 $data['following'] = DI::baseUrl() . '/following/' . $user['nickname'];
 242                 $data['followers'] = DI::baseUrl() . '/followers/' . $user['nickname'];
 243                 $data['inbox'] = DI::baseUrl() . '/inbox/' . $user['nickname'];
 244                 $data['outbox'] = DI::baseUrl() . '/outbox/' . $user['nickname'];
 245                 $data['preferredUsername'] = $user['nickname'];
 246                 $data['name'] = $contact['name'];
 247                 $data['vcard:hasAddress'] = ['@type' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
 248                         'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
 249                 $data['summary'] = BBCode::convert($contact['about'], false);
 250                 $data['url'] = $contact['url'];
 251                 $data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [User::PAGE_FLAGS_NORMAL, User::PAGE_FLAGS_PRVGROUP]);
 252                 $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
 253                         'owner' => $contact['url'],
 254                         'publicKeyPem' => $user['pubkey']];
 255                 $data['endpoints'] = ['sharedInbox' => DI::baseUrl() . '/inbox'];
 256                 $data['icon'] = ['type' => 'Image',
 257                         'url' => $contact['photo']];
 258
 259                 $data['generator'] = self::getService();
 260
 261                 // tags: https://kitty.town/@inmysocks/100656097926961126.json
 262                 return $data;
 263         }
 264
 265         /**
 266          * @param string $username
 267          * @return array
 268          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 269          */
 270         public static function getDeletedUser($username)
 271         {
 272                 return [
 273                         '@context' => ActivityPub::CONTEXT,
 274                         'id' => DI::baseUrl() . '/profile/' . $username,
 275                         'type' => 'Tombstone',
 276                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 277                         'updated' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 278                         'deleted' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
 279                 ];
 280         }
 281
 282         /**
 283          * Returns an array with permissions of a given item array
 284          *
 285          * @param array $item
 286          *
 287          * @return array with permissions
 288          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 289          * @throws \ImagickException
 290          */
 291         private static function fetchPermissionBlockFromConversation($item)
 292         {
 293                 if (empty($item['thr-parent'])) {
 294                         return [];
 295                 }
 296
 297                 $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 298                 $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 299                 if (!DBA::isResult($conversation)) {
 300                         return [];
 301                 }
 302
 303                 $activity = json_decode($conversation['source'], true);
 304
 305                 $actor = JsonLD::fetchElement($activity, 'actor', 'id');
 306                 $profile = APContact::getByURL($actor);
 307
 308                 $item_profile = APContact::getByURL($item['author-link']);
 309                 $exclude[] = $item['author-link'];
 310
 311                 if ($item['gravity'] == GRAVITY_PARENT) {
 312                         $exclude[] = $item['owner-link'];
 313                 }
 314
 315                 $permissions['to'][] = $actor;
 316
 317                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 318                         if (empty($activity[$element])) {
 319                                 continue;
 320                         }
 321                         if (is_string($activity[$element])) {
 322                                 $activity[$element] = [$activity[$element]];
 323                         }
 324
 325                         foreach ($activity[$element] as $receiver) {
 326                                 if (empty($receiver)) {
 327                                         continue;
 328                                 }
 329
 330                                 if (!empty($profile['followers']) && $receiver == $profile['followers'] && !empty($item_profile['followers'])) {
 331                                         $permissions[$element][] = $item_profile['followers'];
 332                                 } elseif (!in_array($receiver, $exclude)) {
 333                                         $permissions[$element][] = $receiver;
 334                                 }
 335                         }
 336                 }
 337                 return $permissions;
 338         }
 339
 340         /**
 341          * Creates an array of permissions from an item thread
 342          *
 343          * @param array   $item       Item array
 344          * @param boolean $blindcopy  addressing via "bcc" or "cc"?
 345          * @param integer $last_id    Last item id for adding receivers
 346          * @param boolean $forum_mode "true" means that we are sending content to a forum
 347          *
 348          * @return array with permission data
 349          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 350          * @throws \ImagickException
 351          */
 352         private static function createPermissionBlockForItem($item, $blindcopy, $last_id = 0, $forum_mode = false)
 353         {
 354                 if ($last_id == 0) {
 355                         $last_id = $item['id'];
 356                 }
 357
 358                 $always_bcc = false;
 359
 360                 // Check if we should always deliver our stuff via BCC
 361                 if (!empty($item['uid'])) {
 362                         $profile = Profile::getByUID($item['uid']);
 363                         if (!empty($profile)) {
 364                                 $always_bcc = $profile['hide-friends'];
 365                         }
 366                 }
 367
 368                 if (DI::config()->get('system', 'ap_always_bcc')) {
 369                         $always_bcc = true;
 370                 }
 371
 372                 if (self::isAnnounce($item) || DI::config()->get('debug', 'total_ap_delivery')) {
 373                         // Will be activated in a later step
 374                         $networks = Protocol::FEDERATED;
 375                 } else {
 376                         // For now only send to these contacts:
 377                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 378                 }
 379
 380                 $data = ['to' => [], 'cc' => [], 'bcc' => []];
 381
 382                 if ($item['gravity'] == GRAVITY_PARENT) {
 383                         $actor_profile = APContact::getByURL($item['owner-link']);
 384                 } else {
 385                         $actor_profile = APContact::getByURL($item['author-link']);
 386                 }
 387
 388                 $terms = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
 389
 390                 if ($item['private'] != Item::PRIVATE) {
 391                         // Directly mention the original author upon a quoted reshare.
 392                         // Else just ensure that the original author receives the reshare.
 393                         $announce = self::getAnnounceArray($item);
 394                         if (!empty($announce['comment'])) {
 395                                 $data['to'][] = $announce['actor']['url'];
 396                         } elseif (!empty($announce)) {
 397                                 $data['cc'][] = $announce['actor']['url'];
 398                         }
 399
 400                         $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
 401
 402                         // Check if the item is completely public or unlisted
 403                         if ($item['private'] == Item::PUBLIC) {
 404                                 $data['to'][] = ActivityPub::PUBLIC_COLLECTION;
 405                         } else {
 406                                 $data['cc'][] = ActivityPub::PUBLIC_COLLECTION;
 407                         }
 408
 409                         foreach ($terms as $term) {
 410                                 $profile = APContact::getByURL($term['url'], false);
 411                                 if (!empty($profile)) {
 412                                         $data['to'][] = $profile['url'];
 413                                 }
 414                         }
 415                 } else {
 416                         $receiver_list = Item::enumeratePermissions($item, true);
 417
 418                         foreach ($terms as $term) {
 419                                 $cid = Contact::getIdForURL($term['url'], $item['uid']);
 420                                 if (!empty($cid) && in_array($cid, $receiver_list)) {
 421                                         $contact = DBA::selectFirst('contact', ['url', 'network', 'protocol'], ['id' => $cid]);
 422                                         if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 423                                                 continue;
 424                                         }
 425
 426                                         if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 427                                                 $data['to'][] = $profile['url'];
 428                                         }
 429                                 }
 430                         }
 431
 432                         foreach ($receiver_list as $receiver) {
 433                                 $contact = DBA::selectFirst('contact', ['url', 'hidden', 'network', 'protocol'], ['id' => $receiver]);
 434                                 if (!DBA::isResult($contact) || (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB))) {
 435                                         continue;
 436                                 }
 437
 438                                 if (!empty($profile = APContact::getByURL($contact['url'], false))) {
 439                                         if ($contact['hidden'] || $always_bcc) {
 440                                                 $data['bcc'][] = $profile['url'];
 441                                         } else {
 442                                                 $data['cc'][] = $profile['url'];
 443                                         }
 444                                 }
 445                         }
 446                 }
 447
 448                 if (!empty($item['parent'])) {
 449                         $parents = Item::select(['id', 'author-link', 'owner-link', 'gravity', 'uri'], ['parent' => $item['parent']]);
 450                         while ($parent = Item::fetch($parents)) {
 451                                 if ($parent['gravity'] == GRAVITY_PARENT) {
 452                                         $profile = APContact::getByURL($parent['owner-link'], false);
 453                                         if (!empty($profile)) {
 454                                                 if ($item['gravity'] != GRAVITY_PARENT) {
 455                                                         // Comments to forums are directed to the forum
 456                                                         // But comments to forums aren't directed to the followers collection
 457                                                         if ($profile['type'] == 'Group') {
 458                                                                 $data['to'][] = $profile['url'];
 459                                                         } else {
 460                                                                 $data['cc'][] = $profile['url'];
 461                                                                 if (($item['private'] != Item::PRIVATE) && !empty($actor_profile['followers'])) {
 462                                                                         $data['cc'][] = $actor_profile['followers'];
 463                                                                 }
 464                                                         }
 465                                                 } else {
 466                                                         // Public thread parent post always are directed to the followers
 467                                                         if (($item['private'] != Item::PRIVATE) && !$forum_mode) {
 468                                                                 $data['cc'][] = $actor_profile['followers'];
 469                                                         }
 470                                                 }
 471                                         }
 472                                 }
 473
 474                                 // Don't include data from future posts
 475                                 if ($parent['id'] >= $last_id) {
 476                                         continue;
 477                                 }
 478
 479                                 $profile = APContact::getByURL($parent['author-link'], false);
 480                                 if (!empty($profile)) {
 481                                         if (($profile['type'] == 'Group') || ($parent['uri'] == $item['thr-parent'])) {
 482                                                 $data['to'][] = $profile['url'];
 483                                         } else {
 484                                                 $data['cc'][] = $profile['url'];
 485                                         }
 486                                 }
 487                         }
 488                         DBA::close($parents);
 489                 }
 490
 491                 $data['to'] = array_unique($data['to']);
 492                 $data['cc'] = array_unique($data['cc']);
 493                 $data['bcc'] = array_unique($data['bcc']);
 494
 495                 if (($key = array_search($item['author-link'], $data['to'])) !== false) {
 496                         unset($data['to'][$key]);
 497                 }
 498
 499                 if (($key = array_search($item['author-link'], $data['cc'])) !== false) {
 500                         unset($data['cc'][$key]);
 501                 }
 502
 503                 if (($key = array_search($item['author-link'], $data['bcc'])) !== false) {
 504                         unset($data['bcc'][$key]);
 505                 }
 506
 507                 foreach ($data['to'] as $to) {
 508                         if (($key = array_search($to, $data['cc'])) !== false) {
 509                                 unset($data['cc'][$key]);
 510                         }
 511
 512                         if (($key = array_search($to, $data['bcc'])) !== false) {
 513                                 unset($data['bcc'][$key]);
 514                         }
 515                 }
 516
 517                 foreach ($data['cc'] as $cc) {
 518                         if (($key = array_search($cc, $data['bcc'])) !== false) {
 519                                 unset($data['bcc'][$key]);
 520                         }
 521                 }
 522
 523                 $receivers = ['to' => array_values($data['to']), 'cc' => array_values($data['cc']), 'bcc' => array_values($data['bcc'])];
 524
 525                 if (!$blindcopy) {
 526                         unset($receivers['bcc']);
 527                 }
 528
 529                 return $receivers;
 530         }
 531
 532         /**
 533          * Check if an inbox is archived
 534          *
 535          * @param string $url Inbox url
 536          *
 537          * @return boolean "true" if inbox is archived
 538          */
 539         private static function archivedInbox($url)
 540         {
 541                 return DBA::exists('inbox-status', ['url' => $url, 'archive' => true]);
 542         }
 543
 544         /**
 545          * Fetches a list of inboxes of followers of a given user
 546          *
 547          * @param integer $uid      User ID
 548          * @param boolean $personal fetch personal inboxes
 549          *
 550          * @return array of follower inboxes
 551          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 552          * @throws \ImagickException
 553          */
 554         public static function fetchTargetInboxesforUser($uid, $personal = false)
 555         {
 556                 $inboxes = [];
 557
 558                 if (DI::config()->get('debug', 'total_ap_delivery')) {
 559                         // Will be activated in a later step
 560                         $networks = Protocol::FEDERATED;
 561                 } else {
 562                         // For now only send to these contacts:
 563                         $networks = [Protocol::ACTIVITYPUB, Protocol::OSTATUS];
 564                 }
 565
 566                 $condition = ['uid' => $uid, 'archive' => false, 'pending' => false];
 567
 568                 if (!empty($uid)) {
 569                         $condition['rel'] = [Contact::FOLLOWER, Contact::FRIEND];
 570                 }
 571
 572                 $contacts = DBA::select('contact', ['url', 'network', 'protocol'], $condition);
 573                 while ($contact = DBA::fetch($contacts)) {
 574                         if (Contact::isLocal($contact['url'])) {
 575                                 continue;
 576                         }
 577
 578                         if (!in_array($contact['network'], $networks) && ($contact['protocol'] != Protocol::ACTIVITYPUB)) {
 579                                 continue;
 580                         }
 581
 582                         if (Network::isUrlBlocked($contact['url'])) {
 583                                 continue;
 584                         }
 585
 586                         $profile = APContact::getByURL($contact['url'], false);
 587                         if (!empty($profile)) {
 588                                 if (empty($profile['sharedinbox']) || $personal) {
 589                                         $target = $profile['inbox'];
 590                                 } else {
 591                                         $target = $profile['sharedinbox'];
 592                                 }
 593                                 if (!self::archivedInbox($target)) {
 594                                         $inboxes[$target] = $target;
 595                                 }
 596                         }
 597                 }
 598                 DBA::close($contacts);
 599
 600                 return $inboxes;
 601         }
 602
 603         /**
 604          * Fetches an array of inboxes for the given item and user
 605          *
 606          * @param array   $item       Item array
 607          * @param integer $uid        User ID
 608          * @param boolean $personal   fetch personal inboxes
 609          * @param integer $last_id    Last item id for adding receivers
 610          * @param boolean $forum_mode "true" means that we are sending content to a forum
 611          * @return array with inboxes
 612          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 613          * @throws \ImagickException
 614          */
 615         public static function fetchTargetInboxes($item, $uid, $personal = false, $last_id = 0, $forum_mode = false)
 616         {
 617                 $permissions = self::createPermissionBlockForItem($item, true, $last_id, $forum_mode);
 618                 if (empty($permissions)) {
 619                         return [];
 620                 }
 621
 622                 $inboxes = [];
 623
 624                 if ($item['gravity'] == GRAVITY_ACTIVITY) {
 625                         $item_profile = APContact::getByURL($item['author-link'], false);
 626                 } else {
 627                         $item_profile = APContact::getByURL($item['owner-link'], false);
 628                 }
 629
 630                 foreach (['to', 'cc', 'bto', 'bcc'] as $element) {
 631                         if (empty($permissions[$element])) {
 632                                 continue;
 633                         }
 634
 635                         $blindcopy = in_array($element, ['bto', 'bcc']);
 636
 637                         foreach ($permissions[$element] as $receiver) {
 638                                 if (empty($receiver) || Network::isUrlBlocked($receiver)) {
 639                                         continue;
 640                                 }
 641
 642                                 if ($item_profile && $receiver == $item_profile['followers']) {
 643                                         $inboxes = array_merge($inboxes, self::fetchTargetInboxesforUser($uid, $personal));
 644                                 } else {
 645                                         if (Contact::isLocal($receiver)) {
 646                                                 continue;
 647                                         }
 648
 649                                         $profile = APContact::getByURL($receiver, false);
 650                                         if (!empty($profile)) {
 651                                                 if (empty($profile['sharedinbox']) || $personal || $blindcopy) {
 652                                                         $target = $profile['inbox'];
 653                                                 } else {
 654                                                         $target = $profile['sharedinbox'];
 655                                                 }
 656                                                 if (!self::archivedInbox($target)) {
 657                                                         $inboxes[$target] = $target;
 658                                                 }
 659                                         }
 660                                 }
 661                         }
 662                 }
 663
 664                 return $inboxes;
 665         }
 666
 667         /**
 668          * Creates an array in the structure of the item table for a given mail id
 669          *
 670          * @param integer $mail_id
 671          *
 672          * @return array
 673          * @throws \Exception
 674          */
 675         public static function ItemArrayFromMail($mail_id)
 676         {
 677                 $mail = DBA::selectFirst('mail', [], ['id' => $mail_id]);
 678                 if (!DBA::isResult($mail)) {
 679                         return [];
 680                 }
 681
 682                 $mail['uri-id'] = ItemURI::insert(['uri' => $mail['uri'], 'guid' => $mail['guid']]);
 683
 684                 $reply = DBA::selectFirst('mail', ['uri'], ['parent-uri' => $mail['parent-uri'], 'reply' => false]);
 685
 686                 // Making the post more compatible for Mastodon by:
 687                 // - Making it a note and not an article (no title)
 688                 // - Moving the title into the "summary" field that is used as a "content warning"
 689                 $mail['body'] = '[abstract]' . $mail['title'] . "[/abstract]\n" . $mail['body'];
 690                 $mail['title'] = '';
 691
 692                 $mail['author-link'] = $mail['owner-link'] = $mail['from-url'];
 693                 $mail['allow_cid'] = '<'.$mail['contact-id'].'>';
 694                 $mail['allow_gid'] = '';
 695                 $mail['deny_cid'] = '';
 696                 $mail['deny_gid'] = '';
 697                 $mail['private'] = true;
 698                 $mail['deleted'] = false;
 699                 $mail['edited'] = $mail['created'];
 700                 $mail['plink'] = $mail['uri'];
 701                 $mail['thr-parent'] = $reply['uri'];
 702                 $mail['gravity'] = ($mail['reply'] ? GRAVITY_COMMENT: GRAVITY_PARENT);
 703
 704                 $mail['event-type'] = '';
 705                 $mail['attach'] = '';
 706
 707                 $mail['parent'] = 0;
 708
 709                 return $mail;
 710         }
 711
 712         /**
 713          * Creates an activity array for a given mail id
 714          *
 715          * @param integer $mail_id
 716          * @param boolean $object_mode Is the activity item is used inside another object?
 717          *
 718          * @return array of activity
 719          * @throws \Exception
 720          */
 721         public static function createActivityFromMail($mail_id, $object_mode = false)
 722         {
 723                 $mail = self::ItemArrayFromMail($mail_id);
 724                 $object = self::createNote($mail);
 725
 726                 if (!$object_mode) {
 727                         $data = ['@context' => ActivityPub::CONTEXT];
 728                 } else {
 729                         $data = [];
 730                 }
 731
 732                 $data['id'] = $mail['uri'] . '/Create';
 733                 $data['type'] = 'Create';
 734                 $data['actor'] = $mail['author-link'];
 735                 $data['published'] = DateTimeFormat::utc($mail['created'] . '+00:00', DateTimeFormat::ATOM);
 736                 $data['instrument'] = self::getService();
 737                 $data = array_merge($data, self::createPermissionBlockForItem($mail, true));
 738
 739                 if (empty($data['to']) && !empty($data['cc'])) {
 740                         $data['to'] = $data['cc'];
 741                 }
 742
 743                 if (empty($data['to']) && !empty($data['bcc'])) {
 744                         $data['to'] = $data['bcc'];
 745                 }
 746
 747                 unset($data['cc']);
 748                 unset($data['bcc']);
 749
 750                 $object['to'] = $data['to'];
 751                 $object['tag'] = [['type' => 'Mention', 'href' => $object['to'][0], 'name' => '']];
 752
 753                 unset($object['cc']);
 754                 unset($object['bcc']);
 755
 756                 $data['directMessage'] = true;
 757
 758                 $data['object'] = $object;
 759
 760                 $owner = User::getOwnerDataById($mail['uid']);
 761
 762                 if (!$object_mode && !empty($owner)) {
 763                         return LDSignature::sign($data, $owner);
 764                 } else {
 765                         return $data;
 766                 }
 767         }
 768
 769         /**
 770          * Returns the activity type of a given item
 771          *
 772          * @param array $item
 773          *
 774          * @return string with activity type
 775          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 776          * @throws \ImagickException
 777          */
 778         private static function getTypeOfItem($item)
 779         {
 780                 $reshared = false;
 781
 782                 // Only check for a reshare, if it is a real reshare and no quoted reshare
 783                 if (strpos($item['body'], "[share") === 0) {
 784                         $announce = self::getAnnounceArray($item);
 785                         $reshared = !empty($announce);
 786                 }
 787
 788                 if ($reshared) {
 789                         $type = 'Announce';
 790                 } elseif ($item['verb'] == Activity::POST) {
 791                         if ($item['created'] == $item['edited']) {
 792                                 $type = 'Create';
 793                         } else {
 794                                 $type = 'Update';
 795                         }
 796                 } elseif ($item['verb'] == Activity::LIKE) {
 797                         $type = 'Like';
 798                 } elseif ($item['verb'] == Activity::DISLIKE) {
 799                         $type = 'Dislike';
 800                 } elseif ($item['verb'] == Activity::ATTEND) {
 801                         $type = 'Accept';
 802                 } elseif ($item['verb'] == Activity::ATTENDNO) {
 803                         $type = 'Reject';
 804                 } elseif ($item['verb'] == Activity::ATTENDMAYBE) {
 805                         $type = 'TentativeAccept';
 806                 } elseif ($item['verb'] == Activity::FOLLOW) {
 807                         $type = 'Follow';
 808                 } elseif ($item['verb'] == Activity::TAG) {
 809                         $type = 'Add';
 810                 } else {
 811                         $type = '';
 812                 }
 813
 814                 return $type;
 815         }
 816
 817         /**
 818          * Creates the activity or fetches it from the cache
 819          *
 820          * @param integer $item_id
 821          * @param boolean $force Force new cache entry
 822          *
 823          * @return array with the activity
 824          * @throws \Exception
 825          */
 826         public static function createCachedActivityFromItem($item_id, $force = false)
 827         {
 828                 $cachekey = 'APDelivery:createActivity:' . $item_id;
 829
 830                 if (!$force) {
 831                         $data = DI::cache()->get($cachekey);
 832                         if (!is_null($data)) {
 833                                 return $data;
 834                         }
 835                 }
 836
 837                 $data = self::createActivityFromItem($item_id);
 838
 839                 DI::cache()->set($cachekey, $data, Duration::QUARTER_HOUR);
 840                 return $data;
 841         }
 842
 843         /**
 844          * Creates an activity array for a given item id
 845          *
 846          * @param integer $item_id
 847          * @param boolean $object_mode Is the activity item is used inside another object?
 848          *
 849          * @return array of activity
 850          * @throws \Exception
 851          */
 852         public static function createActivityFromItem($item_id, $object_mode = false)
 853         {
 854                 $item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
 855
 856                 if (!DBA::isResult($item)) {
 857                         return false;
 858                 }
 859
 860                 if ($item['wall'] && ($item['uri'] == $item['parent-uri'])) {
 861                         $owner = User::getOwnerDataById($item['uid']);
 862                         if (($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) && ($item['author-link'] != $owner['url'])) {
 863                                 $type = 'Announce';
 864
 865                                 // Disguise forum posts as reshares. Will later be converted to a real announce
 866                                 $item['body'] = BBCode::getShareOpeningTag($item['author-name'], $item['author-link'], $item['author-avatar'],
 867                                         $item['plink'], $item['created'], $item['guid']) . $item['body'] . '[/share]';
 868                         }
 869                 }
 870
 871                 if (empty($type)) {
 872                         $condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
 873                         $conversation = DBA::selectFirst('conversation', ['source'], $condition);
 874                         if (DBA::isResult($conversation)) {
 875                                 $data = json_decode($conversation['source'], true);
 876                                 if (!empty($data['type'])) {
 877                                         if (in_array($data['type'], ['Create', 'Update'])) {
 878                                                 if ($object_mode) {
 879                                                         unset($data['@context']);
 880                                                         unset($data['signature']);
 881                                                 }
 882                                                 return $data;
 883                                         } elseif (in_array('as:' . $data['type'], Receiver::CONTENT_TYPES)) {
 884                                                 if (!empty($data['@context'])) {
 885                                                         $context = $data['@context'];
 886                                                         unset($data['@context']);
 887                                                 }
 888                                                 unset($data['actor']);
 889                                                 $object = $data;
 890                                         }
 891                                 }
 892                         }
 893
 894                         $type = self::getTypeOfItem($item);
 895                 }
 896
 897                 if (!$object_mode) {
 898                         $data = ['@context' => $context ?? ActivityPub::CONTEXT];
 899
 900                         if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
 901                                 $type = 'Undo';
 902                         } elseif ($item['deleted']) {
 903                                 $type = 'Delete';
 904                         }
 905                 } else {
 906                         $data = [];
 907                 }
 908
 909                 $data['id'] = $item['uri'] . '/' . $type;
 910                 $data['type'] = $type;
 911
 912                 if (Item::isForumPost($item) && ($type != 'Announce')) {
 913                         $data['actor'] = $item['author-link'];
 914                 } else {
 915                         $data['actor'] = $item['owner-link'];
 916                 }
 917
 918                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
 919
 920                 $data['instrument'] = self::getService();
 921
 922                 $data = array_merge($data, self::createPermissionBlockForItem($item, false));
 923
 924                 if (in_array($data['type'], ['Create', 'Update', 'Delete'])) {
 925                         $data['object'] = $object ?? self::createNote($item);
 926                 } elseif ($data['type'] == 'Add') {
 927                         $data = self::createAddTag($item, $data);
 928                 } elseif ($data['type'] == 'Announce') {
 929                         $data = self::createAnnounce($item, $data);
 930                 } elseif ($data['type'] == 'Follow') {
 931                         $data['object'] = $item['parent-uri'];
 932                 } elseif ($data['type'] == 'Undo') {
 933                         $data['object'] = self::createActivityFromItem($item_id, true);
 934                 } else {
 935                         $data['diaspora:guid'] = $item['guid'];
 936                         if (!empty($item['signed_text'])) {
 937                                 $data['diaspora:like'] = $item['signed_text'];
 938                         }
 939                         $data['object'] = $item['thr-parent'];
 940                 }
 941
 942                 if (!empty($item['contact-uid'])) {
 943                         $uid = $item['contact-uid'];
 944                 } else {
 945                         $uid = $item['uid'];
 946                 }
 947
 948                 $owner = User::getOwnerDataById($uid);
 949
 950                 if (!$object_mode && !empty($owner)) {
 951                         return LDSignature::sign($data, $owner);
 952                 } else {
 953                         return $data;
 954                 }
 955
 956                 /// @todo Create "conversation" entry
 957         }
 958
 959         /**
 960          * Creates a location entry for a given item array
 961          *
 962          * @param array $item
 963          *
 964          * @return array with location array
 965          */
 966         private static function createLocation($item)
 967         {
 968                 $location = ['type' => 'Place'];
 969
 970                 if (!empty($item['location'])) {
 971                         $location['name'] = $item['location'];
 972                 }
 973
 974                 $coord = [];
 975
 976                 if (empty($item['coord'])) {
 977                         $coord = Map::getCoordinates($item['location']);
 978                 } else {
 979                         $coords = explode(' ', $item['coord']);
 980                         if (count($coords) == 2) {
 981                                 $coord = ['lat' => $coords[0], 'lon' => $coords[1]];
 982                         }
 983                 }
 984
 985                 if (!empty($coord['lat']) && !empty($coord['lon'])) {
 986                         $location['latitude'] = $coord['lat'];
 987                         $location['longitude'] = $coord['lon'];
 988                 }
 989
 990                 return $location;
 991         }
 992
 993         /**
 994          * Returns a tag array for a given item array
 995          *
 996          * @param array $item
 997          *
 998          * @return array of tags
 999          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1000          */
1001         private static function createTagList($item)
1002         {
1003                 $tags = [];
1004
1005                 $terms = Tag::getByURIId($item['uri-id'], [Tag::HASHTAG, Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1006                 foreach ($terms as $term) {
1007                         if ($term['type'] == Tag::HASHTAG) {
1008                                 $url = DI::baseUrl() . '/search?tag=' . urlencode($term['name']);
1009                                 $tags[] = ['type' => 'Hashtag', 'href' => $url, 'name' => '#' . $term['name']];
1010                         } else {
1011                                 $contact = Contact::getDetailsByURL($term['url']);
1012                                 if (!empty($contact['addr'])) {
1013                                         $mention = '@' . $contact['addr'];
1014                                 } else {
1015                                         $mention = '@' . $term['url'];
1016                                 }
1017
1018                                 $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
1019                         }
1020                 }
1021
1022                 $announce = self::getAnnounceArray($item);
1023                 // Mention the original author upon commented reshares
1024                 if (!empty($announce['comment'])) {
1025                         $tags[] = ['type' => 'Mention', 'href' => $announce['actor']['url'], 'name' => '@' . $announce['actor']['addr']];
1026                 }
1027
1028                 return $tags;
1029         }
1030
1031         /**
1032          * Adds attachment data to the JSON document
1033          *
1034          * @param array  $item Data of the item that is to be posted
1035          * @param string $type Object type
1036          *
1037          * @return array with attachment data
1038          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1039          */
1040         private static function createAttachmentList($item, $type)
1041         {
1042                 $attachments = [];
1043
1044                 // Currently deactivated, since it creates side effects on Mastodon and Pleroma.
1045                 // It will be reactivated, once this cleared.
1046                 /*
1047                 $attach_data = BBCode::getAttachmentData($item['body']);
1048                 if (!empty($attach_data['url'])) {
1049                         $attachment = ['type' => 'Page',
1050                                 'mediaType' => 'text/html',
1051                                 'url' => $attach_data['url']];
1052
1053                         if (!empty($attach_data['title'])) {
1054                                 $attachment['name'] = $attach_data['title'];
1055                         }
1056
1057                         if (!empty($attach_data['description'])) {
1058                                 $attachment['summary'] = $attach_data['description'];
1059                         }
1060
1061                         if (!empty($attach_data['image'])) {
1062                                 $imgdata = Images::getInfoFromURLCached($attach_data['image']);
1063                                 if ($imgdata) {
1064                                         $attachment['icon'] = ['type' => 'Image',
1065                                                 'mediaType' => $imgdata['mime'],
1066                                                 'width' => $imgdata[0],
1067                                                 'height' => $imgdata[1],
1068                                                 'url' => $attach_data['image']];
1069                                 }
1070                         }
1071
1072                         $attachments[] = $attachment;
1073                 }
1074                 */
1075                 $arr = explode('[/attach],', $item['attach']);
1076                 if (count($arr)) {
1077                         foreach ($arr as $r) {
1078                                 $matches = false;
1079                                 $cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"|', $r, $matches);
1080                                 if ($cnt) {
1081                                         $attributes = ['type' => 'Document',
1082                                                         'mediaType' => $matches[3],
1083                                                         'url' => $matches[1],
1084                                                         'name' => null];
1085
1086                                         if (trim($matches[4]) != '') {
1087                                                 $attributes['name'] = trim($matches[4]);
1088                                         }
1089
1090                                         $attachments[] = $attributes;
1091                                 }
1092                         }
1093                 }
1094
1095                 if ($type != 'Note') {
1096                         return $attachments;
1097                 }
1098
1099                 // Simplify image codes
1100                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $item['body']);
1101
1102                 // Grab all pictures without alternative descriptions and create attachments out of them
1103                 if (preg_match_all("/\[img\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures)) {
1104                         foreach ($pictures[1] as $picture) {
1105                                 $imgdata = Images::getInfoFromURLCached($picture);
1106                                 if ($imgdata) {
1107                                         $attachments[] = ['type' => 'Document',
1108                                                 'mediaType' => $imgdata['mime'],
1109                                                 'url' => $picture,
1110                                                 'name' => null];
1111                                 }
1112                         }
1113                 }
1114
1115                 // Grab all pictures with alternative description and create attachments out of them
1116                 if (preg_match_all("/\[img=([^\[\]]*)\]([^\[\]]*)\[\/img\]/Usi", $body, $pictures, PREG_SET_ORDER)) {
1117                         foreach ($pictures as $picture) {
1118                                 $imgdata = Images::getInfoFromURLCached($picture[1]);
1119                                 if ($imgdata) {
1120                                         $attachments[] = ['type' => 'Document',
1121                                                 'mediaType' => $imgdata['mime'],
1122                                                 'url' => $picture[1],
1123                                                 'name' => $picture[2]];
1124                                 }
1125                         }
1126                 }
1127
1128                 return $attachments;
1129         }
1130
1131         /**
1132          * Callback function to replace a Friendica style mention in a mention that is used on AP
1133          *
1134          * @param array $match Matching values for the callback
1135          * @return string Replaced mention
1136          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1137          */
1138         private static function mentionCallback($match)
1139         {
1140                 if (empty($match[1])) {
1141                         return '';
1142                 }
1143
1144                 $data = Contact::getDetailsByURL($match[1]);
1145                 if (empty($data['nick'])) {
1146                         return $match[0];
1147                 }
1148
1149                 return '@[url=' . $data['url'] . ']' . $data['nick'] . '[/url]';
1150         }
1151
1152         /**
1153          * Remove image elements since they are added as attachment
1154          *
1155          * @param string $body
1156          *
1157          * @return string with removed images
1158          */
1159         private static function removePictures($body)
1160         {
1161                 // Simplify image codes
1162                 $body = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $body);
1163                 $body = preg_replace("/\[img\=(.*?)\](.*?)\[\/img\]/ism", '[img]$1[/img]', $body);
1164
1165                 // Now remove local links
1166                 $body = preg_replace_callback(
1167                         '/\[url=([^\[\]]*)\]\[img\](.*)\[\/img\]\[\/url\]/Usi',
1168                         function ($match) {
1169                                 // We remove the link when it is a link to a local photo page
1170                                 if (Photo::isLocalPage($match[1])) {
1171                                         return '';
1172                                 }
1173                                 // otherwise we just return the link
1174                                 return '[url]' . $match[1] . '[/url]';
1175                         },
1176                         $body
1177                 );
1178
1179                 // Remove all pictures
1180                 $body = preg_replace("/\[img\]([^\[\]]*)\[\/img\]/Usi", '', $body);
1181
1182                 return $body;
1183         }
1184
1185         /**
1186          * Fetches the "context" value for a givem item array from the "conversation" table
1187          *
1188          * @param array $item
1189          *
1190          * @return string with context url
1191          * @throws \Exception
1192          */
1193         private static function fetchContextURLForItem($item)
1194         {
1195                 $conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
1196                 if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
1197                         $context_uri = $conversation['conversation-href'];
1198                 } elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
1199                         $context_uri = $conversation['conversation-uri'];
1200                 } else {
1201                         $context_uri = $item['parent-uri'] . '#context';
1202                 }
1203                 return $context_uri;
1204         }
1205
1206         /**
1207          * Returns if the post contains sensitive content ("nsfw")
1208          *
1209          * @param integer $uri_id
1210          *
1211          * @return boolean
1212          * @throws \Exception
1213          */
1214         private static function isSensitive($uri_id)
1215         {
1216                 return DBA::exists('tag-view', ['uri-id' => $uri_id, 'name' => 'nsfw']);
1217         }
1218
1219         /**
1220          * Creates event data
1221          *
1222          * @param array $item
1223          *
1224          * @return array with the event data
1225          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1226          */
1227         public static function createEvent($item)
1228         {
1229                 $event = [];
1230                 $event['name'] = $item['event-summary'];
1231                 $event['content'] = BBCode::convert($item['event-desc'], false, BBCode::ACTIVITYPUB);
1232                 $event['startTime'] = DateTimeFormat::utc($item['event-start'] . '+00:00', DateTimeFormat::ATOM);
1233
1234                 if (!$item['event-nofinish']) {
1235                         $event['endTime'] = DateTimeFormat::utc($item['event-finish'] . '+00:00', DateTimeFormat::ATOM);
1236                 }
1237
1238                 if (!empty($item['event-location'])) {
1239                         $item['location'] = $item['event-location'];
1240                         $event['location'] = self::createLocation($item);
1241                 }
1242
1243                 return $event;
1244         }
1245
1246         /**
1247          * Creates a note/article object array
1248          *
1249          * @param array $item
1250          *
1251          * @return array with the object data
1252          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1253          * @throws \ImagickException
1254          */
1255         public static function createNote($item)
1256         {
1257                 if (empty($item)) {
1258                         return [];
1259                 }
1260
1261                 if ($item['event-type'] == 'event') {
1262                         $type = 'Event';
1263                 } elseif (!empty($item['title'])) {
1264                         $type = 'Article';
1265                 } else {
1266                         $type = 'Note';
1267                 }
1268
1269                 if ($item['deleted']) {
1270                         $type = 'Tombstone';
1271                 }
1272
1273                 $data = [];
1274                 $data['id'] = $item['uri'];
1275                 $data['type'] = $type;
1276
1277                 if ($item['deleted']) {
1278                         return $data;
1279                 }
1280
1281                 $data['summary'] = BBCode::toPlaintext(BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB));
1282
1283                 if ($item['uri'] != $item['thr-parent']) {
1284                         $data['inReplyTo'] = $item['thr-parent'];
1285                 } else {
1286                         $data['inReplyTo'] = null;
1287                 }
1288
1289                 $data['diaspora:guid'] = $item['guid'];
1290                 $data['published'] = DateTimeFormat::utc($item['created'] . '+00:00', DateTimeFormat::ATOM);
1291
1292                 if ($item['created'] != $item['edited']) {
1293                         $data['updated'] = DateTimeFormat::utc($item['edited'] . '+00:00', DateTimeFormat::ATOM);
1294                 }
1295
1296                 $data['url'] = $item['plink'];
1297                 $data['attributedTo'] = $item['author-link'];
1298                 $data['sensitive'] = self::isSensitive($item['uri-id']);
1299                 $data['context'] = self::fetchContextURLForItem($item);
1300
1301                 if (!empty($item['title'])) {
1302                         $data['name'] = BBCode::toPlaintext($item['title'], false);
1303                 }
1304
1305                 $permission_block = self::createPermissionBlockForItem($item, false);
1306
1307                 $body = $item['body'];
1308
1309                 if (empty($item['uid']) || !Feature::isEnabled($item['uid'], 'explicit_mentions')) {
1310                         $body = self::prependMentions($body, $item['uri-id']);
1311                 }
1312
1313                 if ($type == 'Note') {
1314                         $body = self::removePictures($body);
1315                 } elseif (($type == 'Article') && empty($data['summary'])) {
1316                         $data['summary'] = BBCode::toPlaintext(Plaintext::shorten(self::removePictures($body), 1000));
1317                 }
1318
1319                 if ($type == 'Event') {
1320                         $data = array_merge($data, self::createEvent($item));
1321                 } else {
1322                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1323                         $body = preg_replace_callback($regexp, ['self', 'mentionCallback'], $body);
1324
1325                         $data['content'] = BBCode::convert($body, false, BBCode::ACTIVITYPUB);
1326                 }
1327
1328                 // The regular "content" field does contain a minimized HTML. This is done since systems like
1329                 // Mastodon has got problems with - for example - embedded pictures.
1330                 // The contentMap does contain the unmodified HTML.
1331                 $language = self::getLanguage($item);
1332                 if (!empty($language)) {
1333                         $regexp = "/[@!]\[url\=([^\[\]]*)\].*?\[\/url\]/ism";
1334                         $richbody = preg_replace_callback($regexp, ['self', 'mentionCallback'], $item['body']);
1335                         $richbody = BBCode::removeAttachment($richbody);
1336
1337                         $data['contentMap'][$language] = BBCode::convert($richbody, false);
1338                 }
1339
1340                 $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
1341
1342                 if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
1343                         $data['diaspora:comment'] = $item['signed_text'];
1344                 }
1345
1346                 $data['attachment'] = self::createAttachmentList($item, $type);
1347                 $data['tag'] = self::createTagList($item);
1348
1349                 if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
1350                         $data['location'] = self::createLocation($item);
1351                 }
1352
1353                 if (!empty($item['app'])) {
1354                         $data['generator'] = ['type' => 'Application', 'name' => $item['app']];
1355                 }
1356
1357                 $data = array_merge($data, $permission_block);
1358
1359                 return $data;
1360         }
1361
1362         /**
1363          * Fetches the language from the post, the user or the system.
1364          *
1365          * @param array $item
1366          *
1367          * @return string language string
1368          */
1369         private static function getLanguage(array $item)
1370         {
1371                 // Try to fetch the language from the post itself
1372                 if (!empty($item['language'])) {
1373                         $languages = array_keys(json_decode($item['language'], true));
1374                         if (!empty($languages[0])) {
1375                                 return $languages[0];
1376                         }
1377                 }
1378
1379                 // Otherwise use the user's language
1380                 if (!empty($item['uid'])) {
1381                         $user = DBA::selectFirst('user', ['language'], ['uid' => $item['uid']]);
1382                         if (!empty($user['language'])) {
1383                                 return $user['language'];
1384                         }
1385                 }
1386
1387                 // And finally just use the system language
1388                 return DI::config()->get('system', 'language');
1389         }
1390
1391         /**
1392          * Creates an an "add tag" entry
1393          *
1394          * @param array $item
1395          * @param array $data activity data
1396          *
1397          * @return array with activity data for adding tags
1398          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1399          * @throws \ImagickException
1400          */
1401         private static function createAddTag($item, $data)
1402         {
1403                 $object = XML::parseString($item['object']);
1404                 $target = XML::parseString($item["target"]);
1405
1406                 $data['diaspora:guid'] = $item['guid'];
1407                 $data['actor'] = $item['author-link'];
1408                 $data['target'] = (string)$target->id;
1409                 $data['summary'] = BBCode::toPlaintext($item['body']);
1410                 $data['object'] = ['id' => (string)$object->id, 'type' => 'tag', 'name' => (string)$object->title, 'content' => (string)$object->content];
1411
1412                 return $data;
1413         }
1414
1415         /**
1416          * Creates an announce object entry
1417          *
1418          * @param array $item
1419          * @param array $data activity data
1420          *
1421          * @return array with activity data
1422          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1423          * @throws \ImagickException
1424          */
1425         private static function createAnnounce($item, $data)
1426         {
1427                 $orig_body = $item['body'];
1428                 $announce = self::getAnnounceArray($item);
1429                 if (empty($announce)) {
1430                         $data['type'] = 'Create';
1431                         $data['object'] = self::createNote($item);
1432                         return $data;
1433                 }
1434
1435                 if (empty($announce['comment'])) {
1436                         // Pure announce, without a quote
1437                         $data['type'] = 'Announce';
1438                         $data['object'] = $announce['object']['uri'];
1439                         return $data;
1440                 }
1441
1442                 // Quote
1443                 $data['type'] = 'Create';
1444                 $item['body'] = $announce['comment'] . "\n" . $announce['object']['plink'];
1445                 $data['object'] = self::createNote($item);
1446
1447                 /// @todo Finally descide how to implement this in AP. This is a possible way:
1448                 $data['object']['attachment'][] = self::createNote($announce['object']);
1449
1450                 $data['object']['source']['content'] = $orig_body;
1451                 return $data;
1452         }
1453
1454         /**
1455          * Return announce related data if the item is an annunce
1456          *
1457          * @param array $item
1458          *
1459          * @return array
1460          */
1461         public static function getAnnounceArray($item)
1462         {
1463                 $reshared = Item::getShareArray($item);
1464                 if (empty($reshared['guid'])) {
1465                         return [];
1466                 }
1467
1468                 $reshared_item = Item::selectFirst([], ['guid' => $reshared['guid']]);
1469                 if (!DBA::isResult($reshared_item)) {
1470                         return [];
1471                 }
1472
1473                 if (!in_array($reshared_item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1474                         return [];
1475                 }
1476
1477                 $profile = APContact::getByURL($reshared_item['author-link'], false);
1478                 if (empty($profile)) {
1479                         return [];
1480                 }
1481
1482                 return ['object' => $reshared_item, 'actor' => $profile, 'comment' => $reshared['comment']];
1483         }
1484
1485         /**
1486          * Checks if the provided item array is an announce
1487          *
1488          * @param array $item
1489          *
1490          * @return boolean
1491          */
1492         public static function isAnnounce($item)
1493         {
1494                 $announce = self::getAnnounceArray($item);
1495                 if (empty($announce)) {
1496                         return false;
1497                 }
1498
1499                 return empty($announce['comment']);
1500         }
1501
1502         /**
1503          * Creates an activity id for a given contact id
1504          *
1505          * @param integer $cid Contact ID of target
1506          *
1507          * @return bool|string activity id
1508          */
1509         public static function activityIDFromContact($cid)
1510         {
1511                 $contact = DBA::selectFirst('contact', ['uid', 'id', 'created'], ['id' => $cid]);
1512                 if (!DBA::isResult($contact)) {
1513                         return false;
1514                 }
1515
1516                 $hash = hash('ripemd128', $contact['uid'].'-'.$contact['id'].'-'.$contact['created']);
1517                 $uuid = substr($hash, 0, 8). '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) . '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
1518                 return DI::baseUrl() . '/activity/' . $uuid;
1519         }
1520
1521         /**
1522          * Transmits a contact suggestion to a given inbox
1523          *
1524          * @param integer $uid           User ID
1525          * @param string  $inbox         Target inbox
1526          * @param integer $suggestion_id Suggestion ID
1527          *
1528          * @return boolean was the transmission successful?
1529          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1530          */
1531         public static function sendContactSuggestion($uid, $inbox, $suggestion_id)
1532         {
1533                 $owner = User::getOwnerDataById($uid);
1534
1535                 $suggestion = DI::fsuggest()->getById($suggestion_id);
1536
1537                 $data = ['@context' => ActivityPub::CONTEXT,
1538                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1539                         'type' => 'Announce',
1540                         'actor' => $owner['url'],
1541                         'object' => $suggestion->url,
1542                         'content' => $suggestion->note,
1543                         'instrument' => self::getService(),
1544                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1545                         'cc' => []];
1546
1547                 $signed = LDSignature::sign($data, $owner);
1548
1549                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1550                 return HTTPSignature::transmit($signed, $inbox, $uid);
1551         }
1552
1553         /**
1554          * Transmits a profile relocation to a given inbox
1555          *
1556          * @param integer $uid   User ID
1557          * @param string  $inbox Target inbox
1558          *
1559          * @return boolean was the transmission successful?
1560          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1561          */
1562         public static function sendProfileRelocation($uid, $inbox)
1563         {
1564                 $owner = User::getOwnerDataById($uid);
1565
1566                 $data = ['@context' => ActivityPub::CONTEXT,
1567                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1568                         'type' => 'dfrn:relocate',
1569                         'actor' => $owner['url'],
1570                         'object' => $owner['url'],
1571                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1572                         'instrument' => self::getService(),
1573                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1574                         'cc' => []];
1575
1576                 $signed = LDSignature::sign($data, $owner);
1577
1578                 Logger::log('Deliver profile relocation for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1579                 return HTTPSignature::transmit($signed, $inbox, $uid);
1580         }
1581
1582         /**
1583          * Transmits a profile deletion to a given inbox
1584          *
1585          * @param integer $uid   User ID
1586          * @param string  $inbox Target inbox
1587          *
1588          * @return boolean was the transmission successful?
1589          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1590          */
1591         public static function sendProfileDeletion($uid, $inbox)
1592         {
1593                 $owner = User::getOwnerDataById($uid);
1594
1595                 if (empty($owner)) {
1596                         Logger::error('No owner data found, the deletion message cannot be processed.', ['user' => $uid]);
1597                         return false;
1598                 }
1599
1600                 if (empty($owner['uprvkey'])) {
1601                         Logger::error('No private key for owner found, the deletion message cannot be processed.', ['user' => $uid]);
1602                         return false;
1603                 }
1604
1605                 $data = ['@context' => ActivityPub::CONTEXT,
1606                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1607                         'type' => 'Delete',
1608                         'actor' => $owner['url'],
1609                         'object' => $owner['url'],
1610                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1611                         'instrument' => self::getService(),
1612                         'to' => [ActivityPub::PUBLIC_COLLECTION],
1613                         'cc' => []];
1614
1615                 $signed = LDSignature::sign($data, $owner);
1616
1617                 Logger::log('Deliver profile deletion for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1618                 return HTTPSignature::transmit($signed, $inbox, $uid);
1619         }
1620
1621         /**
1622          * Transmits a profile change to a given inbox
1623          *
1624          * @param integer $uid   User ID
1625          * @param string  $inbox Target inbox
1626          *
1627          * @return boolean was the transmission successful?
1628          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1629          * @throws \ImagickException
1630          */
1631         public static function sendProfileUpdate($uid, $inbox)
1632         {
1633                 $owner = User::getOwnerDataById($uid);
1634                 $profile = APContact::getByURL($owner['url']);
1635
1636                 $data = ['@context' => ActivityPub::CONTEXT,
1637                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1638                         'type' => 'Update',
1639                         'actor' => $owner['url'],
1640                         'object' => self::getProfile($uid),
1641                         'published' => DateTimeFormat::utcNow(DateTimeFormat::ATOM),
1642                         'instrument' => self::getService(),
1643                         'to' => [$profile['followers']],
1644                         'cc' => []];
1645
1646                 $signed = LDSignature::sign($data, $owner);
1647
1648                 Logger::log('Deliver profile update for user ' . $uid . ' to ' . $inbox . ' via ActivityPub', Logger::DEBUG);
1649                 return HTTPSignature::transmit($signed, $inbox, $uid);
1650         }
1651
1652         /**
1653          * Transmits a given activity to a target
1654          *
1655          * @param string  $activity Type name
1656          * @param string  $target   Target profile
1657          * @param integer $uid      User ID
1658          * @return bool
1659          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1660          * @throws \ImagickException
1661          * @throws \Exception
1662          */
1663         public static function sendActivity($activity, $target, $uid, $id = '')
1664         {
1665                 $profile = APContact::getByURL($target);
1666                 if (empty($profile['inbox'])) {
1667                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1668                         return;
1669                 }
1670
1671                 $owner = User::getOwnerDataById($uid);
1672
1673                 if (empty($id)) {
1674                         $id = DI::baseUrl() . '/activity/' . System::createGUID();
1675                 }
1676
1677                 $data = ['@context' => ActivityPub::CONTEXT,
1678                         'id' => $id,
1679                         'type' => $activity,
1680                         'actor' => $owner['url'],
1681                         'object' => $profile['url'],
1682                         'instrument' => self::getService(),
1683                         'to' => [$profile['url']]];
1684
1685                 Logger::log('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1686
1687                 $signed = LDSignature::sign($data, $owner);
1688                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1689         }
1690
1691         /**
1692          * Transmits a "follow object" activity to a target
1693          * This is a preparation for sending automated "follow" requests when receiving "Announce" messages
1694          *
1695          * @param string  $object Object URL
1696          * @param string  $target Target profile
1697          * @param integer $uid    User ID
1698          * @return bool
1699          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1700          * @throws \ImagickException
1701          * @throws \Exception
1702          */
1703         public static function sendFollowObject($object, $target, $uid = 0)
1704         {
1705                 $profile = APContact::getByURL($target);
1706                 if (empty($profile['inbox'])) {
1707                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1708                         return;
1709                 }
1710
1711                 if (empty($uid)) {
1712                         // Fetch the list of administrators
1713                         $admin_mail = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
1714
1715                         // We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
1716                         $condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
1717                         $first_user = DBA::selectFirst('user', ['uid'], $condition);
1718                         $uid = $first_user['uid'];
1719                 }
1720
1721                 $condition = ['verb' => Activity::FOLLOW, 'uid' => 0, 'parent-uri' => $object,
1722                         'author-id' => Contact::getPublicIdByUserId($uid)];
1723                 if (Item::exists($condition)) {
1724                         Logger::log('Follow for ' . $object . ' for user ' . $uid . ' does already exist.', Logger::DEBUG);
1725                         return false;
1726                 }
1727
1728                 $owner = User::getOwnerDataById($uid);
1729
1730                 $data = ['@context' => ActivityPub::CONTEXT,
1731                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1732                         'type' => 'Follow',
1733                         'actor' => $owner['url'],
1734                         'object' => $object,
1735                         'instrument' => self::getService(),
1736                         'to' => [$profile['url']]];
1737
1738                 Logger::log('Sending follow ' . $object . ' to ' . $target . ' for user ' . $uid, Logger::DEBUG);
1739
1740                 $signed = LDSignature::sign($data, $owner);
1741                 return HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1742         }
1743
1744         /**
1745          * Transmit a message that the contact request had been accepted
1746          *
1747          * @param string  $target Target profile
1748          * @param         $id
1749          * @param integer $uid    User ID
1750          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1751          * @throws \ImagickException
1752          */
1753         public static function sendContactAccept($target, $id, $uid)
1754         {
1755                 $profile = APContact::getByURL($target);
1756                 if (empty($profile['inbox'])) {
1757                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1758                         return;
1759                 }
1760
1761                 $owner = User::getOwnerDataById($uid);
1762                 $data = ['@context' => ActivityPub::CONTEXT,
1763                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1764                         'type' => 'Accept',
1765                         'actor' => $owner['url'],
1766                         'object' => [
1767                                 'id' => (string)$id,
1768                                 'type' => 'Follow',
1769                                 'actor' => $profile['url'],
1770                                 'object' => $owner['url']
1771                         ],
1772                         'instrument' => self::getService(),
1773                         'to' => [$profile['url']]];
1774
1775                 Logger::debug('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1776
1777                 $signed = LDSignature::sign($data, $owner);
1778                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1779         }
1780
1781         /**
1782          * Reject a contact request or terminates the contact relation
1783          *
1784          * @param string  $target Target profile
1785          * @param         $id
1786          * @param integer $uid    User ID
1787          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1788          * @throws \ImagickException
1789          */
1790         public static function sendContactReject($target, $id, $uid)
1791         {
1792                 $profile = APContact::getByURL($target);
1793                 if (empty($profile['inbox'])) {
1794                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1795                         return;
1796                 }
1797
1798                 $owner = User::getOwnerDataById($uid);
1799                 $data = ['@context' => ActivityPub::CONTEXT,
1800                         'id' => DI::baseUrl() . '/activity/' . System::createGUID(),
1801                         'type' => 'Reject',
1802                         'actor' => $owner['url'],
1803                         'object' => [
1804                                 'id' => (string)$id,
1805                                 'type' => 'Follow',
1806                                 'actor' => $profile['url'],
1807                                 'object' => $owner['url']
1808                         ],
1809                         'instrument' => self::getService(),
1810                         'to' => [$profile['url']]];
1811
1812                 Logger::debug('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id);
1813
1814                 $signed = LDSignature::sign($data, $owner);
1815                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1816         }
1817
1818         /**
1819          * Transmits a message that we don't want to follow this contact anymore
1820          *
1821          * @param string  $target Target profile
1822          * @param integer $uid    User ID
1823          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1824          * @throws \ImagickException
1825          * @throws \Exception
1826          */
1827         public static function sendContactUndo($target, $cid, $uid)
1828         {
1829                 $profile = APContact::getByURL($target);
1830                 if (empty($profile['inbox'])) {
1831                         Logger::warning('No inbox found for target', ['target' => $target, 'profile' => $profile]);
1832                         return;
1833                 }
1834
1835                 $object_id = self::activityIDFromContact($cid);
1836                 if (empty($object_id)) {
1837                         return;
1838                 }
1839
1840                 $id = DI::baseUrl() . '/activity/' . System::createGUID();
1841
1842                 $owner = User::getOwnerDataById($uid);
1843                 $data = ['@context' => ActivityPub::CONTEXT,
1844                         'id' => $id,
1845                         'type' => 'Undo',
1846                         'actor' => $owner['url'],
1847                         'object' => ['id' => $object_id, 'type' => 'Follow',
1848                                 'actor' => $owner['url'],
1849                                 'object' => $profile['url']],
1850                         'instrument' => self::getService(),
1851                         'to' => [$profile['url']]];
1852
1853                 Logger::log('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, Logger::DEBUG);
1854
1855                 $signed = LDSignature::sign($data, $owner);
1856                 HTTPSignature::transmit($signed, $profile['inbox'], $uid);
1857         }
1858
1859         private static function prependMentions($body, int $uriid)
1860         {
1861                 $mentions = [];
1862
1863                 foreach (Tag::getByURIId($uriid, [Tag::IMPLICIT_MENTION]) as $tag) {
1864                         $profile = Contact::getDetailsByURL($tag['url']);
1865                         if (!empty($profile['addr'])
1866                                 && $profile['contact-type'] != Contact::TYPE_COMMUNITY
1867                                 && !strstr($body, $profile['addr'])
1868                                 && !strstr($body, $tag['url'])
1869                         ) {
1870                                 $mentions[] = '@[url=' . $tag['url'] . ']' . $profile['nick'] . '[/url]';
1871                         }
1872                 }
1873
1874                 $mentions[] = $body;
1875
1876                 return implode(' ', $mentions);
1877         }
1878 }